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I was able to test the clutch hydraulic system with original SP250 clutch and pressure plate using standard 3/4" master cylinder. I added a test gauge at the bleeder port on the slave cylinder. I did not bleed the system - lazy as it was 23°F [-5°C] in the garage. The original system did develop 400 psi and takes 340 psi to release the system. There's no doubt with a 'bled' system it will develop enough pressure for the concentric system and I'll add a clutch travel stop.

The current concentric bearing a Quartermaster 721100 'flat face bearing', vendor states it fine for my system, I'm not comfortable using it and they said they can't supply a rounded face bearing. However I have purchased 2 other raised or rounded face bearings. One has identical ID 1.576" and OD to the flat face at 2.513", the second same ID 1.576" with the OD being slightly larger at 2.958" both are a little thicker than the flat faced bearing.

Next step is to pull the transmission again and weigh up the 2 rounded face bearings which due to slightly different thickness I need to repeat shimming hopefully for the last time.

My concern with the flat bearing was that if it was quite wide and wasn't the same I/D as the fingers it would tend to dig into the fingers as it went in.
Just not a good engineering design i'm sure you'd agree..
steve

have just fitted up a tilton version, but not without its mishaps.
The std. unit comes with a flat bearing for us rolled finger diaphrams .
The supposed replacement part though the same bore size is not a replacment at all, requiring machining of the Hydraulic housing to fit up. The T5 bearing retainer snout is also a tad big on dia. for the new bearing sleeve .Without a lathe and some skills you'd be stymied .
The toyota tube is smaller and may not have the same problems.

good luck, steve.
PS., What has Steve Sanett done for his kit with a concentric release ? ?

Fitted the new Koyo throw out bearing on to the Quartermaster concentric system. Attached line and pressure tested all's good so far. Unfortunately will be traveling starting tomorrow so no chance to install transmission back on engine and run it. So that will be delayed for a while but small steps forward are welcomed.
Although Quarter claim the flat face is fine for the size of clutch the new set up gives more confidence in final outcome.

The piece on the left piece [inner] fits inside the the piece on the right - which as you surmised the bearing is pressed on to. The inner piece has an "O" ring internally to prevent travel along the transmission sleeve. The other piece has two "O" rings internally which permits the axial travel to depress the pressure plate fingers etc.